/*******************************************************************************
 * Breakout Cave Survey Visualizer
 *
 * Copyright (C) 2014 James Edwards
 *
 * jedwards8 at fastmail dot fm
 *
 * This program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free Software
 * Foundation; either version 2 of the License, or (at your option) any later
 * version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc., 51
 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *******************************************************************************/
package org.andork.jogl;

import java.nio.ByteBuffer;

import com.jogamp.opengl.GL;
import com.jogamp.opengl.GL2ES2;

public class JoglBuffer implements JoglResource {
	ByteBuffer buffer;

	int target = GL.GL_ARRAY_BUFFER;

	int id;

	int usage = GL.GL_STATIC_DRAW;

	boolean initialized = false;

	public ByteBuffer buffer() {
		return buffer;
	}

	public JoglBuffer buffer(ByteBuffer buffer) {
		this.buffer = buffer;
		return this;
	}

	@Override
	public void dispose(GL2ES2 gl) {
		if (initialized) {
			gl.glDeleteBuffers(1, new int[] { id }, 0);
			initialized = false;
		}
	}

	public JoglBuffer elementArray() {
		return target(GL.GL_ELEMENT_ARRAY_BUFFER);
	}

	public int id() {
		return id;
	}

	@Override
	public void init(GL2ES2 gl) {
		if (!initialized) {
			int[] vbos = new int[1];
			gl.glGenBuffers(1, vbos, 0);
			id = vbos[0];
			initialized = true;
			rebuffer(gl);
		}
	}

	public void rebuffer(GL2ES2 gl) {
		if (!initialized) {
			init(gl);
		}
		buffer.position(0);
		gl.glBindBuffer(target, id);
		gl.glBufferData(target, buffer.capacity(), buffer, usage);
		gl.glBindBuffer(target, 0);
	}

	public int target() {
		return target;
	}

	public JoglBuffer target(int target) {
		this.target = target;
		return this;
	}

	public int usage() {
		return usage;
	}

	public JoglBuffer usage(int usage) {
		this.usage = usage;
		return this;
	}
}